A beam of light strikes the plane surface of silicate flint glass at an angle of incidence of 45^o. The index of refraction of the glass varies with wavelength as shown in the graph in Figure. How much smaller is the angle of refraction for violet light of wavelength 400 nm than that for red light of wavelength 700nm?

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1.7 Silicate flint glass 1.6 Borate flint glass Quartz Silicate crown glass 1.5 Violet Red 1.4 400 500 600 700 A, nm